Question

Heat of 30 kcal is supplied to a system and 4200 J of external work is done on the system so that its volume decreases at constant pressure.What is change in its internal energy ?

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Answer 1

Answer:

For that, we multiply the heat given in cal with 4200. The heat supplied to a system is denoted as ΔQ. The work done on the system is such that the volume of the system is decreasing. So the work done on the system is negative.